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Service Air conditioner with refrigerant R134a Service Department. Technical Information Service Edition 04.2016 Service Department. Technical Information Service List of Workshop Manual Repair Groups Repair Group 87 Air conditioning system Technical information should always be available to the foremen and mechanics, because their careful and constant adherence to the instructions is essential to ensure vehicle road worthiness and safety. In addition, the normal basic safety precautions for working on motor vehicles must, as a matter of course, be observed. A0053300220 Service . No reproduction without prior agreement from publisher. 2016 Audi AG, Ingolstadt A0053300220 Audi 100 1991 ➤ , Audi 80 1992 ➤ , Audi A1 2011 ➤ , Audi A2 2001 ➤ , A Air conditioner with refrigerant R134a Edition 04.2016 Contents 87 Air conditioning system 1 1 Warning instructions when working on vehicles with high voltage system 1 1.1 Working on vehicles with high voltage system hybrid vehicles 1 1.2 Visual inspection of high voltage components and wiring for damage 2 2 General information on air conditioning systems 4 2.1 General notes 4 2.2 Introduction 4 2.3 Safety measures for vehicles with start/stop system 6 2.4 Other reference material 6 2.5 Principles of air conditioning systems 7 2.6 Refrigerant R134a 9 2.7 Properties of refrigerant R134a 11 2.8 Refrigerant oil 13 2.9 How air conditioning works 14 2.10 General work safety 15 2.11 Product properties 16 2.12 Handling refrigerant 16 2.13 Handling pressure vessels 17 2.14 Safety regulations for working with extraction and charging systems 18 2.15 Safety measures for working on vehicles with air conditioning system and for handling refrigerant R134a 18 2.16 Basic rules for working on refrigerant circuit 22 2.17 Before using air conditioner after system has been re charged 27 3 General information on refrigerant circuit 28 3.1 Components of refr